CorrectTheDate is a script that is useful for correcting those messages you receive where the senders system clock is badly adjusted, and the message displays a date that is different to the real date the message was sent.

Running the script with such a message selected will reset the message date to the date in the first 'received' header in the message, which is probably as close to the real message date as you can get.

CorrectTheDate is accessible from the script menu in Entourage.